Doc: NR Clarify finer point of repeat unfold (issue 5075047)

From:

janek . lilypond

Subject:

Doc: NR Clarify finer point of repeat unfold (issue 5075047)

Date:

Wed, 21 Sep 2011 07:33:54 +0000

LGTM.
From what i see, the surprise in this behaviour comes from two meanings
of "music expression" - it can be understood as "a piece of ly input" or
"a piece of music". Shall we write a sentence about this difference?
I.e. "Using \repeat unfold is equal to writing out a fragment of music
several times over, not a fragments of ly input"?
cheers,
Janek
http://codereview.appspot.com/5075047/